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307 Area Code

Area code 307 serves Cheyenne, Casper, Gillette, Laramie, Rock Springs and nearby communities in Wyoming. It has been in service since January 1, 1947.

StateWyoming
Time zoneMountain
Local time now…
Prefixes in use499
Projected to run out2054
CheyenneCasperGilletteLaramieRock SpringsSheridanEvanstonGreen RiverRivertonJacksonCodyRawlinsLanderPowellDouglasRanchettesTorringtonCheyenneCasperGilletteLaramieRock SpringsSheridan
Cities and towns served by area code 307

Who issues 307 numbers

Mobile 25%VoIP and cable 23%Landline 52%

Share of the 499 prefixes (the three digits after 307) assigned to each type of carrier. Classification by carrier name, approximate.

CarrierPrefixes
Lumen (Qwest)83
Union Telephone Company65
Verizon Wireless60
AT&T Mobility49
Onvoy (Sinch)41
Lumen (Level 3)27
Bandwidth19
Rt Communications17

Cities and towns in area code 307

CityPopulationOther area codes
Cheyenne66,507
Casper58,771
Gillette34,024
Laramie32,284
Rock Springs22,936
Sheridan20,015
Evanston11,705
Green River11,450
Riverton10,910
Jackson10,720
Cody10,377
Rawlins7,745
Lander7,379
Powell6,574
Douglas6,469
Ranchettes6,389
Torrington6,205

Got a call from 307?

A 307 number was originally issued in Wyoming, but that does not prove the caller is there. 23% of 307 prefixes belong to VoIP and cable providers, whose numbers can be bought online and used from anywhere. Caller ID can also be spoofed, so treat urgent requests for money, codes or passwords from any area code with suspicion, and call back on a number you already know.

All 499 prefixes in area code 307

Format: (307) XXX-YYYY. Carrier is the company the block was originally assigned to; numbers may since have been ported to another carrier.

Questions about area code 307

Where is area code 307?
Area code 307 is in Wyoming. It covers Cheyenne, Casper, Gillette, Laramie, Rock Springs, Sheridan and 11 more cities and towns.
What time zone is area code 307?
Area code 307 is in the Mountain time zone.
Is 307 a toll-free number?
No. 307 is a geographic area code in Wyoming. Toll-free numbers in the US start with 800, 833, 844, 855, 866, 877 or 888.
Will area code 307 run out of numbers?
NANPA's latest forecast projects area code 307 to exhaust in the fourth quarter of 2054. Before that happens, a new area code is usually added as an overlay; existing numbers keep their code.

Other area codes in Wyoming